Table 1. Comparison of the spectroscopic and structural features of Cummins' Mo–N2-dimer redox-series (Ar = C6H3-3,5-Me2)16 with square-pyramidal pincer complexes (M = Re,17 Mo,19 or W; * computed value).
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| Compound | 1 | — | 22+ | 3 (M = Re) | 4 (M = Mo) | 6 (M = W) | 7+ (M = W) | 82+ (M = W) |
| n | 0 | +1 | +2 | 0 | 0 | 0 | +1 | +2 |
| Configuration | {π10} | {π9} | {π8} | {π10δ4} | {π8δ4} | {π8δ4} | {π8δ3} | {π8δ2} |
| d(NN) [Å] | 1.212(2)/1.217(2) | 1.239(4) | 1.265(5) | 1.202(10) | 1.258(9) | 1.33(4)/1.27(8) | 1.277(5) | 1.266(12) |
| ν(NN) [cm–1] | 1630 | 1503 | 1349 | 1771* | 1343 | 1392 | 1414 | 1400 |
| S | 1 | 1/2 | 0 | 1 | 0 | 0 | 1/2 | 1 |